air over hydraulic brake

例句：

1. 1. The air over the hydraulic brake is very thin.
   液压制动器上方的空气非常稀薄。
2. 2.The car was moving slowly because of the heavy air over the hydraulic brake.
   由于液压制动器上方空气重，汽车移动得很慢。
3. 3. The engineer had to open the air vents over the hydraulic brake to clear the air.
   工程师不得不打开液压制动器上方的通风口来清除空气。